Hyperbees just published a new physics game called Shaky Tower, it is a physics puzzler with a lot of different gameplay mechanics from a new developer called Mobilness.
You stack towers, roll around per accelerometer or do both at once. The game has a lot of content (6 Worlds, 2 game modes and over 100 Level, a level editor and more levels are coming soon) and it is available for free on the Android market.
However, it has in app purchases to get rid of the ads and you can buy more currency to unlock other features like a level skip, new levelpacks etc.

They were so kind to provide us with 20 promo codes, that will get rid of the ads for you and they will credit you some extra virtual currency.

To get one of the codes, send me a mail with the subject line Giveaway to … and I will reply with the code.

All of the codes are gone now.

How to use them:
In the game go to the shop, tap “Get *”, then tap Enter promo code.
Key in promo code, tap “OK”. You will get 25 Stars. Please note this
works for Android 2.0+ only. Each code can be used only once by one
person. The code is associated with player’s Google account.